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<blockquote data-quote="Moble Enclosurs" data-source="post: 7532844" data-attributes="member: 634917"><p>Well, the plexi will help two ways.....it will help lower audible distortion from the drivers to the listener (but always try to keep that down as much as possible anyhow), and will help in the response smoothness as well. This is because it actually acts to diffuse to sound and send it azimuth into all directions. It acts as part of the design, and not just a protective plate. it's like a 4th order without the access panel, lol. It increases HF response from the driver and if the design is tuned low, it can smooth the response.</p><p></p><p>Now, regarding port placement, this is not a direct answer, but if the cabin is small enough, it can virtually be placed in any direction with minimal changes in the audible sound. Usually, when the sound reaches the cutoff point of the response, the phasing is quite different, and can cause a helpful filter-like drop-off on either side fo the usable response passband. In this case, and many others, it is wise to verify the phase of the design when constructing it's acoustical output to ensure the phase does not change more than 90 degrees from the tuning frequency of the design. This is usually the end points of the designs passband and verifies its usable response. Anything outside of a 90 phase change, will have timing issues and sound more muddy than directive response frequencies, therefore decreasing quality and causing possible cancellation, though the cancellation is usually in the higher range of frequencies above 80Hz.</p><p></p><p>Most will say, face it to the rear and you'll be fine. While this is partially true, make sure that if you design it that way, that the phase is smooth from the tuning frequency down to the LF cutoff point and above the tuning as well. Any given driver will have a potential to create a 1.5 octave passband for a response, and the lower the tuning, the smaller the band, making it more narrow-banded, so be careful not to tune it too low as well. A 25Hz cutoff will give you a usable passband of 25-62.5Hz for example, and a 35Hz cutoff will give you a usable passband of 35-87.5Hz. That is a 15Hz band increase from adjusting to a higher cutoff frequency. It can make a difference. Other than that, you should be good.</p><p></p><p>Hoe that helps!</p></blockquote><p></p>
[QUOTE="Moble Enclosurs, post: 7532844, member: 634917"] Well, the plexi will help two ways.....it will help lower audible distortion from the drivers to the listener (but always try to keep that down as much as possible anyhow), and will help in the response smoothness as well. This is because it actually acts to diffuse to sound and send it azimuth into all directions. It acts as part of the design, and not just a protective plate. it's like a 4th order without the access panel, lol. It increases HF response from the driver and if the design is tuned low, it can smooth the response. Now, regarding port placement, this is not a direct answer, but if the cabin is small enough, it can virtually be placed in any direction with minimal changes in the audible sound. Usually, when the sound reaches the cutoff point of the response, the phasing is quite different, and can cause a helpful filter-like drop-off on either side fo the usable response passband. In this case, and many others, it is wise to verify the phase of the design when constructing it's acoustical output to ensure the phase does not change more than 90 degrees from the tuning frequency of the design. This is usually the end points of the designs passband and verifies its usable response. Anything outside of a 90 phase change, will have timing issues and sound more muddy than directive response frequencies, therefore decreasing quality and causing possible cancellation, though the cancellation is usually in the higher range of frequencies above 80Hz. Most will say, face it to the rear and you'll be fine. While this is partially true, make sure that if you design it that way, that the phase is smooth from the tuning frequency down to the LF cutoff point and above the tuning as well. Any given driver will have a potential to create a 1.5 octave passband for a response, and the lower the tuning, the smaller the band, making it more narrow-banded, so be careful not to tune it too low as well. A 25Hz cutoff will give you a usable passband of 25-62.5Hz for example, and a 35Hz cutoff will give you a usable passband of 35-87.5Hz. That is a 15Hz band increase from adjusting to a higher cutoff frequency. It can make a difference. Other than that, you should be good. Hoe that helps! [/QUOTE]
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